CVE-2026-59641: Atlassian Cryptographic Failure in org.bouncycastle:bcmail-lts8on Dependency in Confluence Data Center
This Atlassian advisory covers CVE-2026-59641 in Confluence Data Center and Server and Crowd Data Center and Server.
- CVE-2026-59641
Key facts
- Vendor rating
- High, CVSS 8.7
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber· base score 8.7, scored by bcorgAttack vector: network. Attack complexity: low. Attack requirements: none. Privileges required: none. User interaction: none. Confidentiality impact on the vulnerable system: none. Integrity impact on the vulnerable system: high. Availability impact on the vulnerable system: none. Confidentiality impact on subsequent systems: none. Integrity impact on subsequent systems: none. Availability impact on subsequent systems: none.- Weakness
- CWE-345 Insufficient Verification of Data Authenticity
- CISA SSVC
- Exploitation: none observed. Automatable: yes. Technical impact: partial. CISA, .
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Confluence Data Center and Server: 10.2.0 to 10.2.18 (LTS); Confluence Data Center and Server: 10.1.0 to 10.1.2; Confluence Data Center and Server: 10.0.2 to 10.0.3 and 13 more below
- Fixed in
- Confluence Data Center and Server: 11.0.0 Data Center Only, Confluence Data Center and Server: 10.2.19 (LTS) recommended Data Center Only, Confluence Data Center and Server: 9.2.26 (LTS) Data Center Only and 1 more below
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
Cryptographic Failure in org.bouncycastle:bcmail-lts8on Dependency in Confluence Data Center. Affected: Confluence Data Center and Server, Crowd Data Center and Server.
Listed in Atlassian's Security Bulletin of October 20 2026.
Text from the source record.
- Confluence Data Center and Server: 10.2.0 to 10.2.18 (LTS)
- Confluence Data Center and Server: 10.1.0 to 10.1.2
- Confluence Data Center and Server: 10.0.2 to 10.0.3
- Confluence Data Center and Server: 9.5.1 to 9.5.4
- Confluence Data Center and Server: 9.4.0 to 9.4.1
- Confluence Data Center and Server: 9.3.1 to 9.3.2
- Confluence Data Center and Server: 9.2.0 to 9.2.25 (LTS)
- Confluence Data Center and Server: 9.1.1
- Confluence Data Center and Server: 8.9.8
- Confluence Data Center and Server: 8.5.17 to 8.5.31 (LTS)
- Confluence Data Center and Server: 7.19.29 to 7.19.30 (LTS)
- Crowd Data Center and Server: 7.2.0 to 7.2.3
- Crowd Data Center and Server: 7.1.0 to 7.1.7
- Crowd Data Center and Server: 7.0.0 to 7.0.3
- Crowd Data Center and Server: 6.3.0 to 6.3.7
- Crowd Data Center and Server: 6.2.0 to 6.2.6
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-59641
Upgrade to a fixed release named by Atlassian:
- Confluence Data Center and Server: 11.0.0 Data Center Only
- Confluence Data Center and Server: 10.2.19 (LTS) recommended Data Center Only
- Confluence Data Center and Server: 9.2.26 (LTS) Data Center Only
- Crowd Data Center and Server: 7.2.4 recommended Data Center Only
Vendor guidance
- Upgrade to a fixed version listed by Atlassian: Confluence Data Center and Server: 11.0.0 Data Center Only; Confluence Data Center and Server: 10.2.19 (LTS) recommended Data Center Only; Confluence Data Center and Server: 9.2.26 (LTS) Data Center Only; Crowd Data Center and Server: 7.2.4 recommended Data Center Only.
Support dates for the fixed release lines
- Atlassian Confluence 11.0: support ends
- Atlassian Confluence 10.2: support ends
- Atlassian Confluence 9.2: support ends
- Atlassian Confluence 7.2: support ended
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